Microsip Macos [best] -

MicroSIP is built using the Windows API (Win32) and PJSIP stack. The developer focused on leveraging Windows’ native telephony services (TAPI) and kernel-level optimizations. Porting this to macOS would require a complete rewrite using Swift/Objective-C and CoreAudio, which the maintainer has not prioritized due to the project's open-source, passion-driven nature.

Even though there is no native app, you can still run the Windows version of MicroSIP on a Mac by using software that bridges the gap between the two operating systems. 1. Using Wine or WineBottler microsip macos

Even with a native client, Mac users face unique challenges. MicroSIP is built using the Windows API (Win32)